If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

John is the son of Jacob.
So,
Jacob is the_____of John's father?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

why number 8549176320 is one of a kind?